7. The chart shows the waiting times forcustomers while having winter tiresinstalled on their cars.Time (min)Frequency30-351035-401640-452145-501750-551955-608.60-652.When calculating the standard deviation fordata in intervals, use the following formulas:t • m)- NN.andwhere f is the respective frequency of eachinterval and m is the mterval midpoint.a) Using the midpoints of the intervalsas the measurements, estimate themean and standard deviation of thewait times.b) Did you use the population or sampleformulas? Why?c) Calculate the z-scores of each of themidpoints.d) Draw a histogram and mark theinformation from part c) on the graph.

Given: Time and frequency We have to calculate mean and standard deviation and z score, histogram

Answered: 7. The chart shows the waiting times…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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#10 What is the standard deviation of the following: 18, 18, 11, 13, 35, 50 Round to 2 decimal places as needed.
O DESCRIPTIVE STATISTICS Mean, median, and mode: Comparisons The total blood cholesterol level was measured for each of 21 adults. Here are the 21 measurements (in mg/dL). 132, 144, 151, 153, 165, 167, 176, 180, 184, 184, 184, 194, 195, 196, 196, 210, 211, 214, 219, 234, 241 Send data to calculator Send data to Excel Frequency 10 6. 8- 6+ 4 4 2- 150 175 200 225 250 125 Cholesterol level (in mg/dL) OMean (a) For these data, which measures of central tendency take more than one value? Choose all that apply. OMedian O Mode ONone of these measures (b) Suppose that the measurement 241 (the OMean largest measurement in the data set) were Median Check Explanation 2021 McGraw-Hl Education. All Righ II
#27
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Check my work Find the mean and standard deviation for each uniform continuous model. (Round "Mean" answers to 1 decimal place and "Standard deviation" answers to 4 decimal places.) Mean standard deviation a. U(2, 12) b. U(90, 250) C. U(1, 93) Prev 2 of 8 Next
A Scenario: Jimmy store sells large tins of Tom Tucker Coffee. The deli uses a periodic review system. Inventory is checked every 10 days which more orders are needed for tins. Order lead time is 3 days. Average demand is 7 tins, so average demand during the reorder period and order lead time (13) is 91 tins. Standard deviation of demand during the same 13 day period is 17 tins.1. Calculate the restocking level ( Assume the desired level is 90%)2. Suppose standard deviation of demand during the 13-day period drops to 4 tins. What happened to restocking level? Explain why?3. Draw a saw-tooth diagram. Beginning inventory level is equal to restocking level and the demand rate is a constant 7 tins per day. What is the safety stock level? What is the average inventory level?
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Directions: Determine the parameter to be tested in each situation by writing your answer on a separate sheet of paper. Translate it into symbols. 2. A newspaper article stated that students in the country take an average of 4 years to finish their undergraduate degrees. Suppose that you believe the mean time is longer, you conducted survey on 49 students. The result obtained a sample mean of 5 with a sample standard deviation of 1.2.
Calculate the sample mean and sample standard deviation of the test scores. Frequency 6. Test Scores 40 - 49 50 - 59 60 - 69 7 4. 70-79 80 - 89 8 90 - 99 1 Round your answer to two decimal places. Mean = Standard Deviation = Question Help: DVideo Check Answer e here to search F2 F3 F4 F5 F6 F7 F8 FS #3 2$ & * 3 4. 7 8. CO 团
The numbers of courses taught per semester by a random sample of university professors are shown in the histogram. Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. O Series1 30 25 20 15 24 10 20 16 3. 1 3 4 (a) Make a frequency distribution for the data. Frequency Distribution Table f 1 2 3 4 The sample mean is, x (Round to one decimal place as needed.) The sample standard deviation is, s (Round to one decimal place as needed.)
The target population is the weekly income of students in 2017. The mean weekly income of STAT150 students in 2017 (population mean), µ, was $198 and the population standard deviation, o, was $34. A histogram of the weekly income of a large number of students from this population is shown, below, to illustrate the shape of the weekly income distribution. Frequency 70 60 50 40 30 20 10 0 140 160 Histogram of Weekly Income 180 220 Weekly Income 200 240 260 280 a) What shape is the distribution of student weekly income?

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